Looper mechanism for sewing-machines.



PATBNTED FEB. 17, 1903.

. 'L, ONDERDONK. LOOPERMEOHANISM FOR SEWING MACHINES.

APPLIOAT ION PILED JAN. 6, 1897.

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50 B represents a feed rocking shaft, and b the UNITE STATES PATENTOFFICE.

LANSING ONDERDONK, OF WINTHROP, MASSACHUSETTS, ASSIGNOR TO THE UNIONSPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS.

LOOPER MECHANISM FOR SEWING-MACHINES.

SPECIFIQATION forming part of Letters Patent No. 721,076, dated February1'7, 1903.

Application filed January 6, 1897.

To all whom it may concern.-

Be it known that I, LANSING ONDERDONK, a

citizen of the United States, residing at Win- I throp, in the county ofSufiolk, State of Mas- 5 sachusetts, have invented certain new and.

useful Improvements in Looper Mechanism for Sewing-Machines,, of whichthe following is a description, reference being had to the accompanyingdrawingsand to the letters and I figures of reference marked thereon.

My invention relates to an improvement in double-chain-stitchsewing-machines, and particularlytoanarrangementforsupportingandoperating the under-thread-carryin glooper of r such machines, theobject of the invention being to provide a machine having such aconstruction and arrangement of loopers and needles and mechanism foroperating the loopers that the latter may be moved forward and back totake and leave the loop in a simple curved line, dispensing with two ofthe usual four motions of the looper-namely, the sidewise, orneedle-avoiding movementsthe loopers in both their forward and backwardmovements passing on the front side of the needles. Furthermore, the useof loopjspreaders for either the needle-loop or l o oper-loo'p isnot,nec-.

essary in the present construction. 7

The invention consists in the various matters hereinafter described, andreferred to in' the appended claims. p In the accompanying drawings,which illustrate the invention, Figure l is a top. plan view of so muchof a sewing-machine as is 3 5 necessary to a complete understanding ofmy invention, which is shown as applied thereto; and Fig. 2 is asidelelevation of the same.

In the drawings, -A'repres ents the bed of the machine, and a, a a and a-the bear- 4o ing-lugs and supports, to which the cloth-plate H isattached by means of screws in the usual manner.

J represents the needle-bar of usual construction and operated in anywell-known manner, beingherein shown as provided with two eye-pointedthread carryin g needles 1, arranged at points diagonal to each otherrespecting the line of the feed, which is in the direction of the arrowshown in Fig. l.

outer end a head 7, having sockets in which suitable manner.

Serial No. 618,154. (N6 model.)

and shaftbeing operated in any suitable and well-known manner from thedriving-shaft. The driving-shaft is shown at E and on its end hasa' headD, forming a crank in which is secured a screw-stud 01, having on itsend a ball 6.

C represents an armor link having end heads 2 and 3, the head2 having asocket in. which the ball 6 fits, having a free movement therein, andthe head 3 having a socket in which the ball 4 on the stud 5 fits, thisballstud5 beingsecured to an arm F by being screwed therein, a check-nut0 being also provided. This arm F, which I call the loopercarrierconnection-arm, is attached to or integral with the looper-carrier,herein shown as a sleeve C embracing and turning on a screw stud or postC secured in the lug a on the bed of the machine. Attached to orintegral with the sleeve C and projecting therefrom is the curved arm G,which has at its are set the shanks of the loopers 8, the loopers beingsecured in the sockets by the setoscillates the loopers will properlytake and vrecede from the loops.

While the looper-carrier as a whole is herein shown as comprising thepivoted sleeve C the arm G, and the connection rod or arm F, I do notwish to be limited to this precise construction in all my claims; but itwill be ob,- vious that the sleeve maybe dispensed with and thearm; Grbe arranged to oscillate in any So when in the claims I use the termlooper-carrier or looper-carrying frame I mean thereby a generic termcovering an oscillating supporting device for the loopers.Furthermor'e,.l donot wish to be limited to the exact number of loopersand needles herein shown, as more orless may be provided at will, andtheneedles may be arranged abreast instead 'of diagonally to each otherrespecting the line of feed. In the construction herein shown theneedles are set with their eyes at right angles to the line of mo feedand the looper is grooved for the reception of its thread on the outsideand is threaded from the outside to the inside, which is the side towardthe needle, or on the inside of the curve of the looper. The stitchfeeds off the points of the loopers in the direction of the arrow. InFig. 1 the manner of forming the stitch is shown.

Various modifications and changes in the construction of the device maybe made without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is-

1. In a sewing-machine having a feeding mechanism movingin a definedpath,a threadcarrying needle havingits eye arranged transversely to theline of feed, and a thread-carrying looper, with means for imparting toit positive reciprocation in a single horizontal plane, and in a curvedpath substantially tangential with the line of feed from a point infront to a point in rear of the needle, whereby the stitch is fed oifthe point of the looper; substantially as described.

2. In a sewing-machine having a feeding mechanism movinginadefinedpath,a threadcarrying needle havingits eye arranged transversely to theline of feed, and a thread-carrying looper grooved upon its outer sidefor the reception of its thread, with means for imparting to it positivereciprocation in a single horizontal plane from a point in front to apoint in rear of the needle, and in a curved path, substantiallytangential with the line of feed, whereby the stitch is fed off thepoint of the looper; substantially as described.

In testimony whereof I aftix my signature in presence of two witnesses.

LANSING ONDERDONK.

\Vitnesses:

CHAS. L. STURTEVANT, F. S. FAVVCETT.

